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Full text of "The manufacture and properties of iron and steel"

HEAT TKEATMENT.
279
result is seen in a lower elastic ratio.   The ductility does not seem to be materially improved in any instance.
The cold finishing raised the strength of the bars 1727 pounds per square inch in Group I, 1882 pounds in Group II, and 2395 pounds in Group III. Annealing lowered the strength of these cold-finished bars so that in Group I it was 766 pounds per square inch below the annealed hot-finished bar, while in Group II it was
TABLE XY-E.
Effect of Annealing on Bars of Different Thickness, when the Percentage of Seduction in Boiling had been Constant for all Pieces.
of bil hes.
Ultimate strength ; Ibs per gq. inch.
Elastic limit; Ibs. per sq. inch.
Elongation
in 8 inches ;
per cent.
Reduction of area; per cent.
4x4
4606
2
51640 51120 60850 63320
45870 45100 46850 46010 44960
88440 82660 85700 87860
25680 26850 25980 26680 28570
87.50 82.50 82.50 81.26
87.50 88.00 89.50 34.00 81.25
60.1 66.4 60.8 61.0
64.8 64.0 67.0 64.3
67.2
4x4
8227
59540 59780 60960 62360 65180
63360 51360 52460 51280 64110
29080 28410 29860 28580 81170
85.00 29.75 80.00 27.50 26.25
82.50 82.75 81.75 80.00 28.25
60.0 66.4 60.0 60.7 58.9
59.7 60.1 56.6 62.4 64.9
1509
i 4x4
2x}
67860 67550 67470
63560 62680 62660
42850 43190 44090
88750 88810 40430
25.00 26.25 26.25
26.50 29.00 29.25
40.8 46.1 53.2
57.8 68.4 66.1
i 4x4
1440
72840 71280 72950 78620 78560
47080 46010 48760 51550 58140
43580 42020 43920 48880 53200
25.00 26.25 26.25 26.25 22.75
27.00 29.00 26.25 26.50 25.25
40.7 40.5 52.1 45.9 52.0
63.6 53.4 55.4 54.1 58.6
595 pounds above it, and in Group III 474: pounds. The effect upon the elastic limit is not as thorough, and the influence of the cold finishing may be seen in the higher elastic ratio of the annealed cold-finished bar.
SEC.-XYc.—Effect of annealing on bars rolled under different conditions of work and temperature.—All these results will be corroborated by Tables XY-E and XY-F, which show the effect of annealing on bars which have been finished under different conditions. In Table XY-E, where each bar was made from a billet